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    <p>I would suggest doing JSON or XML serialization and then encrypting the contents with some algorithm. I wouldn't go with binary serialization because it's not very friendly when you need to change the assembly version.</p> <p>I am using the following code together with Newtonsoft.Json (you can get it on NuGet) to accomplish this:</p> <pre><code>using System.IO; using System.Security.Cryptography; using System.Text; using Newtonsoft.Json; class SecureJsonSerializer&lt;T&gt; where T : class { private readonly string filePath; private readonly ICryptoTransform encryptor; private readonly ICryptoTransform decryptor; private const string Password = "some password"; private static readonly byte[] passwordBytes = Encoding.ASCII.GetBytes(Password); public SecureJsonSerializer(string filePath) { this.filePath = filePath; var rmCrypto = GetAlgorithm(); this.encryptor = rmCrypto.CreateEncryptor(); this.decryptor = rmCrypto.CreateDecryptor(); } private static RijndaelManaged GetAlgorithm() { var algorithm = new RijndaelManaged(); int bytesForKey = algorithm.KeySize / 8; int bytesForIV = algorithm.BlockSize / 8; algorithm.Key = key.GetBytes(bytesForKey); algorithm.IV = key.GetBytes(bytesForIV); return algorithm; } public void Save(T obj) { using (var writer = new StreamWriter(new CryptoStream(File.Create(this.filePath), this.encryptor, CryptoStreamMode.Write))) { writer.Write(JsonConvert.SerializeObject(obj)); } } public T Load() { using (var reader = new StreamReader(new CryptoStream(File.OpenRead(this.filePath), this.decryptor, CryptoStreamMode.Read))) { return JsonConvert.DeserializeObject&lt;T&gt;(reader.ReadToEnd()); } } } </code></pre>
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    1. COIsn't there any native .NET way to do it without any 3rd party addons ? I tend not to use external classes.
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    2. COAlso I don't want a fully fledged encryption, just a reliable way to save and load data.
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    3. COOriginally you had encryption in your question, that's why I posted this. Yes, you can use XmlSerializer. Here's an example using it: http://www.jonasjohn.de/snippets/csharp/xmlserializer-example.htm
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